Qt 6.2 + CMake + extending QML with a C++ class

[paulmasri]

So for clarity for anyone with the same question, the following CMakeLists.txt makes the class Person available to QML via import People, by packaging it behind the scenes as Peopleplugin.

cmake_minimum_required(VERSION 3.16)

project(MyProject VERSION 0.1 LANGUAGES CXX)

set(CMAKE_AUTOMOC ON)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(Qt6 6.2 COMPONENTS Quick REQUIRED)

qt_add_executable(appMyProject
    main.cpp
)

qt_add_qml_module(appMyProject
    URI MyProject
    VERSION 1.0
    QML_FILES main.qml
)
qt_add_qml_module(People
    URI People
    VERSION 1.0
    SOURCES Person.h Person.cpp
)

target_include_directories(Peopleplugin
     PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}
)

target_compile_definitions(appMyProject
    PRIVATE $<$<OR:$<CONFIG:Debug>,$<CONFIG:RelWithDebInfo>>:QT_QML_DEBUG>)
target_link_libraries(appMyProject
    PRIVATE Qt6::Quick People)

and for those eagle-eyed, main.qml was buggy and should be:

import QtQuick
import People

Window {
    width: 640
    height: 480
    visible: true

    Text {
        text: personBob.name + " wears size " + personBob.shoeSize + " shoes."
    }

    Person {
        id: personBob
        name: "Bob Jones"
        shoeSize: 12
    }
}

The C++ class Person is derived from QObject:

#include <QObject>
#include <QtQml/qqml.h>

class Person : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString name READ name WRITE setName NOTIFY nameChanged)
    Q_PROPERTY(int shoeSize READ shoeSize WRITE setShoeSize NOTIFY shoeSizeChanged)
    QML_ELEMENT
...

main.cpp is as autogenerated when creating a new Qt Quick 6.2 project in Qt Creator and makes no mention of Person or the People plugin.

Other C++ classes can #include "Person.h" and make use of the Person class.